JPS6126661Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a connecting pin for attaching a V-block of a drive belt for a belt-driven continuously variable transmission to a carrier.

Conventionally, in belt-driven continuously variable transmissions, the drive belt is formed by movably attaching metal V-blocks in succession to a carrier that has a multilayer structure of endless metal bands. ing.
This drive belt is then wound around two V-shaped belt pulleys placed a predetermined distance apart, and torque is transmitted from the driving side V-type belt pulley to the driven side V-type belt pulley via the drive belt. is being carried out.

Next, to explain a conventional belt-driven continuously variable transmission, in FIGS. 1 and 2, a V-shaped belt pulley 1 on the drive side includes a fixed pulley 2 having a partially conical drive surface 2a, and a fixed pulley 2 having a partially conical drive surface 2a. There is a movable pulley 3 having a partially conical driving surface 3a that is the same as that of the movable pulley 2. Both pulleys 2 and 3 have their driving surfaces 2a and 3a facing each other to form a V-groove 4,
It is attached to a drive shaft 5, and the movable pulley 3 can be moved in the direction of the fixed pulley 2 or in the opposite direction by hydraulic means or the like. The V-type belt pulley 6 on the driven side is the V-type belt pulley 1 on the drive side.
It has almost the same shape as , and the driven shaft 7 is located at the center of the shaft.
is attached. V groove 4 of V type belt pulley 1
The drive belt 8, which is hung over the V-groove (not shown) of the V-type belt pulley 6, is made up of multiple layers of endless metal bands 9a, 9b, 9c, . . . 9j, which are very thin but have the same width. A V-block 10 made of a strong metal having a predetermined thickness is continuously and movably attached to a carrier 9 formed in layers.

Here, the V block 10 has a tapered side surface 11
a, 11a, and this main body 1
square bar-shaped horizontal guides 12, 12 that protrude upward perpendicularly to the upper surface 11b from both ends of the upper surface 11b of 1;
There is. Pin holes 12a, 12a parallel to the upper surface 11b of the main body 11 are provided in the upper portions of both lateral guides 12, 12, respectively, and both ends of the connecting pin 13 are inserted into the pin holes 12a, 12a. are fitted into each other. Then, the upper surface 11b of the main body part 11 and both lateral guides 1
2 and 12 form a carrier groove 14. Both sides 1 of the main body 11 of the V block 10
The taper angles 1a and 11a make are approximately the same as the taper angle of the V groove 4 of the V-type belt pulley 1. To attach the V-block 10 to the carrier 9, the carrier 9 is inserted into the carrier groove 14 of the V-block 10, and the endless metal band 9 on the innermost circumference of the carrier 9 is inserted.
j is brought into contact with the upper surface 11b of the main body portion 11. Next, one end of the connecting pin 13 is inserted into the pin hole 12a of one of the horizontal guides 12 located above the carrier 9, and this end is moved in the direction of the other horizontal guide 12 and inserted into the pin hole of this horizontal guide 12. It can be attached to the carrier 9 by driving it into 12a. In this way, the drive belt 8 is formed by successively attaching a large number of V blocks 10 to the carrier 9.

When the V-type belt pulley 1 rotates counterclockwise in FIG. 1 and reaches the V-shaped belt pulley 6, where torque is transmitted to the V-shaped belt pulley 6.

Here, in order to attach the conventional V block 10 to the carrier 9, as described above, after inserting the connecting pin 13 into the pin hole 12a of one side guide 12, the insertion side end of this connecting pin 13 is inserted into the other side. It was necessary to drive it into the pin hole 12a of the horizontal guide 12. For this reason, it is not easy to attach and detach the V-block from the carrier, and it takes a lot of time to attach and detach the V-block. However, in order to allow the connecting pin to be attached to and removed from the V-block, the pin hole of one horizontal guide of the V-block should be tightly fitted to the outer diameter of the connecting pin, and the pin hole of the other horizontal guide should be tightly fitted to the outer diameter of the connecting pin. It was necessary to control the hole diameter with strict tolerances to ensure a loose fit.

In view of the above, the object of this invention is to provide a connecting pin for attaching a V-block, which allows the V-block to be easily attached to and detached from the carrier of a drive belt for a continuously variable transmission.

Next, this invention will be explained based on embodiments shown in the drawings.

3 to 5, the V block 15 has a tapered side surface 1, similar to the conventional V block 10.
It has a main body portion 16 having 6a, 16a and block-shaped lateral guides 17, 17. In the V-block 15, the front surface 16b of the main body 16 and the front surfaces 17a, 17a of both lateral guides 17, 17 are on the same plane. A protrusion 1 protrudes forward from the top of the front surface 16b of the main body 16.
8 and 18 are formed. The front surface 18a of this protrusion 18 is parallel to the front surface 17a of the horizontal guide 17. The protrusion 18 has a front surface 1
8a, a surface connecting with the upper part of the front surface 17a of the horizontal guide 17 and the front surface 16b of the main body part 16 is an arcuate surface. The main body part 16 has both lateral guides 17,1
A protrusion 19 having the same shape as the protrusion 18 is formed on the front surface of the portion located between the protrusions 18 and 7.
The upper surface 19a is located below the upper edge of the front surface 18a of the protrusion 18. The thickness t ₁ of the main body portion 16 is the fourth
As shown in the figure, it is thinner than the thickness t of the horizontal guide 17. Recesses 20 into which the protrusions 18, 18 of the transverse guides 17, 17 and the protrusion 19 of the main body 16 fit are formed on the back surfaces of the transverse guides 17, 17 and the main body 16. The upper part of the main body part 16 is cut out obliquely from the lower edge 20a of the recess 20 toward the rear end of the upper surface of the protrusion 19, so that the inclined surface 16
It's becoming c. Therefore, this V block 15
are the inner peripheral surface of the endless metal band 9j of the carrier 9 and the protrusion 1
Only the upper surface 19a of 9 makes contact.

The connecting pin 21 is composed of a housing 22, a movable shaft 23, a fixed shaft 24, and a coiled compression spring 25. The housing 22 has a cylindrical shape, and one end side of the shaft hole 22a is connected to the shaft hole 2.
Small shaft hole 22b having a diameter smaller than the diameter of 2a
It's getting old. Therefore, an annular stopper portion 22c is formed inside the housing 22 at the boundary between the shaft hole 22a and the small shaft hole 22b. The movable shaft 23 has a round bar-shaped base 23a that is movable in the axial direction within the shaft hole 22a of the housing 22.
Continuing from this base 23a, there is a small shaft hole 22b of the housing 22, which has a smaller diameter than the diameter of the base 23a.
There is a middle diameter portion 23b that is movable inside. The distal end of the medium diameter portion 23b has a predetermined length, and the insertion portion 23 has a diameter smaller than the diameter of the medium diameter portion 23b.
It's becoming c. Therefore, the movable shaft 23 has an annular stepped portion 23d at the boundary between the base portion 23a and the middle diameter portion 23b, and the middle diameter portion 23b and the insertion portion 2
3c is an annular stepped portion 23e. The movable shaft 23 has an insertion portion 23
The diameter of c is such that it can be loosely fitted into the pin hole 17b of the horizontal guide 17. The fixed shaft 24 includes a fixed part 24a fitted into the end of the shaft hole 22a of the housing 22, a flange part 24b having a diameter larger than the outer diameter of the housing 22 and the width t of the horizontal guide 17, and the fixed part 24a. and flange part 2
4b, and has an insertion part 24c formed on the opposite side of the fixing part 24a and protruding from the flange part 24b. The diameter of the insertion portion 24c of the fixed shaft 24 is also set to a size that allows it to fit loosely into the pin hole 17b of the horizontal guide 17.

Next, in order to assemble the connecting pin 21, insert the insertion part 23c side of the movable shaft 23 into the shaft hole 22a of the housing 22, and insert the insertion part 23c and a part of the medium diameter part 23b from the small shaft hole 22b of the housing 22. make it stand out. Next, the shaft hole 2 of the housing 22
After inserting the compression spring 25 into the shaft hole 22a
The fixed shaft 24 is attached to the housing 22 by press-fitting the fixed part 24a of the fixed shaft 24 into the end of the housing 22 until the flange part 24b thereof contacts the end surface of the housing 22. As a result, compression spring 2
5 presses the movable shaft 23 and inserts the insertion portion 23
b is pushed out from the small shaft hole 22b of the housing 22, and the stepped portion 23d of the movable shaft 23 is brought into contact with the stopper portion 22c of the housing 22.

Connecting pin 21 assembled as described above
The entire length is the both side guides 17 of the V block 15,
It is longer than the pin width of 17.

Next, in order to attach this connecting pin 21 to the V block 15, the compression spring 2 of the movable shaft 23 is
5 into the housing 22 to make the length of the connecting pin 21 shorter than the pin width of both lateral guides 17, 17 of the V block 15. Then, the insertion portion 24c of the fixed shaft 24 is inserted into the pin hole 17b of one of the horizontal guides 17. Then,
When the insertion portion 23c of the movable shaft 23 is aligned with the pin hole 17b of the other horizontal guide 17, the compression spring 25
extends and pushes out the stepped portion 23e of the insertion portion 23c until it comes into contact with the inner surface of the horizontal guide 17, and the insertion portion 2
3c into the pin hole 17b. This results in
The connecting pin 21 is attached to the V block 15.

Next, in order to attach the V block 15 to the carrier 9, the upper surface 19a of the protrusion 19 of the V block 15 is brought into contact with the endless metal band 9j on the inner circumference of the carrier 9, and then the V block 15 is attached as described above. Attach the connecting pin 21 to. As a result, one V block 15 is attached to the carrier 9. Next, in order to attach the second V-block 15 (hereinafter referred to as 15A to distinguish it from the first V-block) to the carrier 9, open the recess 20 of the V-block 15.
Insert the protrusion 18 of this V block 15A into the hole.
Then, the connecting pin 21 of the V-block 15A is installed with the direction of the connecting pin 21 opposite to that of the connecting pin 21 of the V-block 15. To attach the next V block 15B to the carrier 9, attach it to the V block 15B with the connecting pin 21 facing the same direction as the V block 15. As a result, the flange portions 24b of each connecting pin 21 are arranged alternately (sixth
), each V block 15, 15A, 15B
regulates the lateral movement of

As above, attach V block 1 to carrier 9.
5 are successively attached to form a drive belt 8A.

Next, to remove the V block 15 from the carrier 9, push the flange portion 24b of the connecting pin 21 against the biasing force of the compression spring 25, and
from the pin hole 12a of the fixed shaft 24 to the fixed part 2 of the fixed shaft 24.
Pull out 4a. Next, when the insertion portion 23c of the movable shaft 23 is pulled out from the pin hole 12a of the horizontal guide 12, the connecting pin 21 is removed from the V-block 15. The V-block 15 is therefore removed from the carrier 9.

As mentioned above, this invention consists of a cylindrical housing having a shaft hole, and a connecting pin for attaching a V-block to a carrier, and an end that can be loosely fitted into a hole in one horizontal guide and protrudes from one end of the housing by a predetermined length. A movable shaft that can be loosely fitted into the shaft hole of the housing, an insertion part that can be loosely fitted into the hole of the other lateral guide, and a flange part and a fixing part having a diameter larger than the outer diameter of the housing. The movable shaft is constructed of a fixed shaft fitted to the other end of the housing and a compression spring provided within the housing that biases the insertion portion of the movable shaft in a direction to push out the movable shaft from the housing, resulting in the following effects.

(1) By pushing the movable shaft into the housing against the biasing force of the compression spring, the connecting pin can be extended to a length that allows it to be inserted into the holes in both side guides, making it easy to attach and detach the connecting pin to and from the V-block. This makes it easy to attach and detach the V-block to and from the carrier, so it can be attached and detached in a short time.

(2) Since the connecting pin only needs to be loosely fitted into the hole in the horizontal guide of the V block, the tolerance of the hole diameter can be loosened, and the V
The number of man-hours required for block machining can be reduced.

(3) Since the connecting pin can freely rotate with respect to the horizontal guide, the friction when the outermost endless metal band of the carrier contacts the connecting pin is reduced, and wear of the outermost endless metal band can be suppressed.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional belt-driven continuously variable transmission, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Figs.
FIG. 6 shows an embodiment of this invention, and FIG.
FIG. 4 is a side view of the V block, FIG. 5 is an enlarged cross-sectional view taken along the - line in FIG. 4, and FIG.
Figure A is a front view showing a partially assembled state of the V-block, and Figure 6B is a plan view of Figure 6B. 1... V-type belt wheel, 6... V-type belt wheel, 8
A... Drive belt, 9... Carrier, 9a, 9
b, 9c...9j... Endless metal band, 15 (15
A, 15B)... V block, 16... Main body,
17... Horizontal guide, 17b... Pin hole, 21...
Connection pin, 22...housing, 22a...shaft hole, 23...movable shaft, 23c...insertion part,
24... fixed shaft, 24b... flange part,
24c...insertion section, 25...compression spring.

Claims (1)

[Scope of utility model registration request] A V-block has a main body and a pair of horizontal guides provided on both upper sides of the main body, and a carrier groove is formed by the both horizontal guides and the upper part of the main body.
A connection for attaching a V-block of a drive belt for a continuously variable transmission, in which both ends are fitted into the pin holes of both lateral guides when attached to a carrier formed by stacking endless metal bands in multiple layers via a carrier groove. With a pin,
a cylindrical housing having a diameter larger than the pin hole; a movable shaft having one end loosely fitted into the pin hole of one horizontal guide and the other end loosely fitting into the housing so that it cannot be removed from the housing; The fixed shaft is loosely fitted into the pin hole of the horizontal guide, and the other end is tightly fitted into the housing, and the compression spring is disposed within the housing between the movable shaft and the fixed shaft. A connecting pin for attaching the V-block of the drive belt for continuously variable transmissions.